R&D Report 1954-21 : A comparison of two zoom lenses
W.N. Sproson, M. Gilbert
The investigation described undertaken in view of the interest shown in these lenses by Television Outside Broadcasts Department and other specialist departments in Engineering Division. The tests can be divided into two main groups, (a) determination of axial modulation/frequency characteristics and (b) general appraisal of image quality over the 40mm diagonal field required for the image orthicon camera. Some further remarks will be added about mechanical features of the two lenses.